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Quantum Efficiency using typical Bayer filterLooking at Bayer filter of a typical consumer camera, one can easily see that sensitivity of the filter for each color is all over the place. Are there filters similar to Bayer that do a better job at separating and keeping the sensitivity within each color's own frequency band? What different mechanics do such filters employ?

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    $\begingroup$ What do you mean by "each color's own frequency band"? Or, more to the point - there is always some arbitrariness as to how the different bands are defined, and it depends on what you're doing and why. Sharp cliff-face filters that 'instantaneously' transition from one filter to another sound like a good thing, but if you're trying to model the human eye's response, then it's probably not the best choice. And if you're not trying to model the human response, why keep it to three bands instead of, say, ten? $\endgroup$ – Emilio Pisanty Jun 29 '17 at 18:14
  • $\begingroup$ You have a point. By each color's own frequency band I mean a span that would be put in the same bucket - like red or blue "part" of the rainbow. However that doesn't answer the question itself. $\endgroup$ – NoobPointerException Jun 29 '17 at 18:21
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The thing here is that there is no absolute standard of where one band ends and another band begins, and depending on the application there's a huge number of possible choices that make sense.

In this regard, one common system that might suit what you're looking for is the Wratten system for astrophotography (where sharply tuned colour filters tend to be quite useful), and they come in quite a handful:

Image source

If what you're looking for is strict bandpass filters at bands that one can recognize as red, green and blue, then these MaxMax XNiteBP filters probably fit the bill,

with the caveat that there will be some cyan and yellow light sources that it just doesn't see.

So: within the vague confines of the question as you've posed it, there's plenty of interesting solutions, each with its own tradeoffs, and with its own underlying physical mechanisms. Beyond that it's hard to say anything else.

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